* Objetos `datetime`.
    * Objetos `UUID`.
    * Modelos de bases de datos.
    * ...y muchos más.
* Documentación automática e interactiva incluyendo 2 interfaces de usuario alternativas:
    * Swagger UI.
    * ReDoc.

---

Volviendo al ejemplo de código anterior, **FastAPI** va a:

* Validar que existe un `item_id` en el path para requests usando `GET` y `PUT`.

////

/// tip

You could use the same technique to extend the JSON Schema and add your own custom extra info.

For example you could use it to add metadata for a frontend user interface, etc.

///

/// info

OpenAPI 3.1.0 (used since FastAPI 0.99.0) added support for `examples`, which is part of the **JSON Schema** standard.

Notice that the error also clearly states exactly the point where the validation didn't pass.

This is incredibly helpful while developing and debugging code that interacts with your API.

///

## Documentation

## Check it

Run the server and go to the docs: <a href="http://127.0.0.1:8000/docs" class="external-link" target="_blank">http://127.0.0.1:8000/docs</a>.

You'll see the user interface like:

<img src="/img/tutorial/security/image07.png">

Authorize the application the same way as before.

Using the credentials:

Username: `johndoe`
Password: `secret`

/// check

<a href="https://typer.tiangolo.com" target="_blank"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg" style="width: 20%;"></a>

Əgər siz veb API əvəzinə terminalda istifadə ediləcək <abbr title="Command Line Interface">CLI</abbr> proqramı qurursunuzsa, <a href="https://typer.tiangolo.com/" class="external-link" target="_blank">**Typer**</a>-a baxa bilərsiniz.

</div>

////

/// tip | "Dica"

Toda vez que você instalar um **novo pacote** naquele ambiente, **ative** o ambiente novamente.

Isso garante que, se você usar um **programa de terminal (<abbr title="interface de linha de comando">CLI</abbr>)** instalado por esse pacote, você usará aquele do seu ambiente virtual e não qualquer outro que possa ser instalado globalmente, provavelmente com uma versão diferente do que você precisa.

///

<a href="https://typer.tiangolo.com" target="_blank"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg" style="width: 20%;"></a>

웹 API 대신 터미널에서 사용할 <abbr title="Command Line Interface">CLI</abbr> 앱을 만들고 있다면, <a href="https://typer.tiangolo.com/" class="external-link" target="_blank">**Typer**</a>를 확인해 보십시오.

**Typer**는 FastAPI의 동생입니다. 그리고 **FastAPI의 CLI**가 되기 위해 생겼습니다. ⌨️ 🚀

## 요구사항

---

## **Typer**, le FastAPI des <abbr title="Command Line Interface">CLI</abbr>

<a href="https://typer.tiangolo.com" target="_blank"><img src="https://typer.tiangolo.com/img/logo-margin/logo-margin-vector.svg" style="width: 20%;"></a>

    * `datetime` objects.
    * `UUID` objects.
    * Database models.
    * ...and many more.
* Automatic interactive API documentation, including 2 alternative user interfaces:
    * Swagger UI.
    * ReDoc.

---

Coming back to the previous code example, **FastAPI** will:

* Validate that there is an `item_id` in the path for `GET` and `PUT` requests.

* **Valider des données** : venant de chaque requête :
    * Générant automatiquement des **erreurs** renvoyées au client quand la donnée est invalide.
* **Documenter** l'API avec OpenAPI :
    * ce qui ensuite utilisé par les interfaces utilisateur automatiques de documentation interactive.